Method for treating high-salt-concentration industrial wastewater at different ionic concentrations
A technology for industrial wastewater and treatment methods, applied in ion-exchange water/sewage treatment, energy wastewater treatment, water/sewage treatment, etc., can solve problems such as the inability to effectively separate and crystallize salt, and the inability to achieve zero discharge of wastewater. The effect of emissions
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Embodiment 1
[0034] Embodiment 1: when the concentration ratio of chloride ion and sulfate ion in high salinity industrial waste water is less than 1:4, the specific treatment method of high salt content industrial waste water comprises the following steps:
[0035] (1) High-salt industrial wastewater first enters the regulating tank for water quality and water volume adjustment, and then enters the high-density sedimentation tank, and adds one or more of liquid caustic soda, soda ash, lime, magnesium agent, PAC or PFS to the high-density sedimentation tank Several types, stay for 30 seconds to 2 minutes, then add flocculant PAM to the high-density sedimentation tank, stay for 8-20 minutes, then settle for 2-3 hours, and finally add acid to return the pH of high-salt industrial wastewater to Between 6.5 and 7.5, the supernatant in the high-density sedimentation tank enters the precision filter device, and the sediment in the high-density sedimentation tank enters the sludge dewatering room;...
Embodiment 2
[0048] Embodiment 2: when the ratio of chloride ion and sulfate ion in the high-salt industrial waste water is greater than 2:3, the processing method of high-salt industrial waste water comprises the following steps:
[0049] (a): (1) High-salt industrial wastewater first enters the high-salt water adjustment tank for water quality and water volume adjustment, and then enters the high-density sedimentation tank, and at the same time adds liquid caustic soda, soda ash, lime, magnesium, and PAC to the high-density sedimentation tank Or one or more of PFS, stay for 30 seconds to 2 minutes, and then add flocculant PAM to the high-density sedimentation tank, stay for 8-20 minutes, then settle for 2-3 hours, and finally add acid to reduce the high The pH of the saline industrial wastewater is adjusted back to 6.5-7.5, the supernatant in the high-density sedimentation tank enters the precision filter device, and the sediment in the high-density sedimentation tank enters the sludge de...
Embodiment 3
[0058] Embodiment 3: when the ratio of chloride ion and sulfate ion in the high-salt industrial waste water is between 1:4-2:3, the treatment method of high-salt industrial waste water comprises the following steps:
[0059] (A) judge whether the alkalinity in the high-salt industrial wastewater is greater than 3000mg / L;
[0060] (B) When alkalinity is less than 3000mg / L in the high-salt industrial wastewater, and in the whole process of processing high-salt industrial wastewater, the step of adding acid is all selected sulfuric acid to ensure that the sulfate ion concentration is far greater than the chloride ion concentration; In this case, the method for processing the high-salt industrial wastewater is the same as the treatment method when the concentration ratio of chloride ion and sulfate ion is less than 1:4 in the high-salt industrial wastewater; When the concentration is 3000mg / L, hydrochloric acid is selected in the steps that need to add acid in the whole process of...
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